Crankcase oil of the straight or non-detergenttype. Suitable for use in re-circulating and totalloss lubrication systems on certain veteran andolder vintage cars and motorcycles where theengines operate under low to moderate speeds,loads and temperatures. Must be changedevery 1000 miles / 1500 km, as was usual withearly engines.SPECIFICATION: API SA CASTORENE R50S 1LTR